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Very effective and safe design, BUT, the wasted power in the sense R and the mosfet are HORRID!

Thank you so much for your videos about impedance! They are so helpful. Can you make something else related to impedance in the future? Maybe a DI box project to better match impedance of the guitar output and line input for those sound cards that don't have a Hi-Z instrument input, or a simple mic preamp to reduce impedance of a high impedance electret mic capsule or piezo element.

How are the batteries holding up? And what is your club car battery tray made out of (underneath your seat)? My club car only has metal bars down there but I’d love more of a floor to block water and such

LAST STARFIGHTER 40TH ANNIVERSARY 1984-2024!

1984😊

Hello love the tube amp videos, so educational and easy to follow @ 19:31 I would speculate that the aparent lower power compression below 1k has to do with the distortion behaviour of the output transformer. Looking at the distortion plots there is increased distortion below 1k, I would argue the core is saturating and the aparent lack of compression measured is the rise in distortion where the core is active (<2k). I am by no means an expert and could likely be very wrong :)

What are you looking at to decide distortion is becoming wonky? Thank you

Thank you for taking the time to do this video!

It's not just variations in current drawn from the supply that cause reservoir cap voltage to vary. Here in South West England, my mains supply voltage varies a few percent with a regular pattern to it. It's like two or three simultaneous things varying the voltage, each having a different frequency in the range one to three Hz. If you concentrate you can see brightness fluctuations in an incandescent lamp, and also hear the same variations in the magnetostriction hum of a large transformer.

Having just watched the movie, this barely even resembles it. They completely cut Harry and Alex, the destruction of the Palomino, Kate's near-lobotomy, and removed any personality from the cast. Oh, and the scene with the meteor chasing the crew across the bridge was mirrored. I know they had very little run time on the record, but yikes! I grew up with this record, but wow, it's very very inaccurate. 😂 Edit: Thanks for uploading, I'm glad I could hear this again!

Bravo bravo bravo

Must be nice I have one rn I've had since I was like 8

Doug has helped me find my mystery transformer primary and secondary pins, identified correctly. Amazing teacher!

Good explanation of the different supply options. How does this final circuit differ from "capacitance multiplier? To my untrained eye it does not. I'll try the last one out. Is it necessary to filter it further with an inductor or can I pass it straight to plate?

I keep coming back to this as it's one of the best explanations of this circuit in a practical application that I know of. However MOSFET pass device that R4 needs a better explanation. Am I right in R4 drops more than 6.4v then that's current limiting?

This is a series Voltage Regulator versus a Shunt Regulator, many prefer a voltage source feeding a Shunt Regulator for Audio Electronics as it is more stable to powers line fluctuations. A Shunt Regulator would have the Drain going to ground and the Source near the incoming voltage..

My wife, and I, studied: "REACTANT PHYS -- UCSD -- CURRICULUM - there be -- none of this!" Youngya -- + De -- + Doug <<< named by - the Muse

He used, the Muse -- intel -- i.e. gov? And he'll deny, he be -- Muse! Unifique - Muse -- Constitutional -- ownership -- of US school!

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Great video. Thanks

What specific Oscilliscope do you use? And do you recommend a specific non-DIY tone generator?

Guitar smp builders look elsewhere. The main subject is not used

One of the best explanations of load lines and the effect on amplification I've seen in years! Thank you for posting this.

"Let's begin nowwww..."

Drawing never work Illusion... physical activity materials piesa purtyxhQn then your jvy tools

Awesome 👍👌

This is genius! You guys deserve a patent for this !

You make these "cheap" russian tubes work for hifi, fantastic! For negative bias Voltage I often use a small 1" by 1" print trafo 230V/9V and hook it up the the 6,3V ac heater winding (or to mains and use a voltage doubling bridge depending on -V needs). My local supplier has these small trafos for 0,95€ and they're light and small enough to be placed under the chassis.

Nice circuit! I especially like the power supply. Most people either use no MOSFETs at all or go crazy with super complicated transistor circuits. I just checked and the FQP10N60C is very affordable and available.These should also work as mosfet followers in the signal chain. Some ideas: No input transformer and use a 6N2P with higher gain for preamp tubes, Ra 120k with Va about 200V should give nice swing. And add the CCS tail could to your -22V supply. 6H8C only has a datasheet-µ of 21,5 , real life v/v of maybe 15.. Do you think this will work well with a 6N2P/12ATX or does the GU17 need the beefier driver with more current capability?

Love your educational videos especially this one and the load lines one! Very easy to follow and understand. Regarding transformers, output ones, I am looking at trying a 5k:5ohm LL1682 but my speakers are 8ohm, was wondering what problems would that cause like maybe bandwith issues. Need a good 10k:8ohm in my circuit but 8k would work. My output tubes are 6p1p in push pull A class. Thank you for posting all this great stuff and looking forward to new affordable tube discoveries and projects. PS: Russian 6H7C are very cheap preamp tubes with good linearity and paraleled are capable to drive interstage trafos, could be an affordable alternative to 6SN7 with a little less gain. They where intended for class B output stages. George.

What pa are you using

31

if I wanted to calculate the output power that the amplifier provides before switching to class B, how can I do it? that is, I want to know the power only in class A. thanks

Great tutorial, thank you

Did you bypass the obc? Or just hook them up to original positive and negitive cables?

nice video thanks, a doubt arises at minute 36, if the supply voltage is 360v how does the signal oscillate up to 520?

I have 2 transformers that do not have markings or data sheet. Only a schematic of where it belongs. Do you mind if I email you some questions to help identify the pins of primary/secondary? Thank you.

Just wanted to say I enjoyed this video. I already have a OTL amp based on this tube (16 of them!). Hope you give some detail about the output tranformer. Not sure what EM label near mosfet signifies. Does it mean encasement mode?

I had to subscribe. I like your calm demeanor and straight forward informative approach! Thank you

You are awesome bro!!! Thanks!!! How are they holding up??

Dude, do everyone (including yourself) a favor and write a script. Its really hard to watch and understand your videos with all the "uuhh" and "uuummm" in that monotone. The content is cool, the execution is rough.

I had one in late 60’s. Loved it

Why did you use an RCA instead of a XLR?

I have Epoch. I was considering big battery also. Very similar kit. I bought the 60ah kit and like you mentioned it wasn’t enough. I had to upgrade a d buy one more battery to bring me to 90ah. The epoch is a nice kit

I have repaired mine a couple times in 20 years . No longer able . any replacement speakers that would be ok ? Do they need to be 4 ohm ?

What about negative feedback to make it regulated?

where the hell is June?

Wow 😂 I just tell the high output impedance source alter my headphone very much and no reverb 😂 I can't see the reverb more effect when damping factoe is low, just frequency response. With my own, the bass is more deep and the sound signature is warmer or duller 😂.

Can you make a same tutorial for biasing otl amps? cuz I just built one recently and I wanna tune it to sound good because it sounds very bad right now😂 my tubes are 6h8c and 6l6gc my setup is self biasing but I think I think I messed up with my resistor values on the cathode

I found this helpful how you test transformers